[MD Bookmarks] Convert bookmark list to iron-list.

chrome/test/data/webui/md_bookmarks/list_test.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 suite('<bookmarks-list>', function() {
   var list;
   var store;
 
   setup(function() {
     store = new bookmarks.TestStore({
       nodes: testTree(createFolder(
           '0',
           [
             createItem('1'),
             createFolder('3', []),
             createItem('5'),
             createItem('7'),
           ])),
       selectedFolder: '0',
     });
     bookmarks.Store.instance_ = store;
 
     list = document.createElement('bookmarks-list');
+    list.style.height = '100%';
+    list.style.width = '100%';
+    list.style.position= 'absolute';
+
     replaceBody(list);
     Polymer.dom.flush();
   });
 
   test('renders correct <bookmark-item> elements', function() {
     var items = list.root.querySelectorAll('bookmarks-item');
     var ids = Array.from(items).map((item) => item.itemId);
 
     assertDeepEquals(['1', '3', '5', '7'], ids);
   });
@@ skipping 14 matching lines @@
     assertEquals('select-items', store.lastAction.name);
     assertTrue(store.lastAction.add);
     assertEquals('5', store.lastAction.anchor);
     assertDeepEquals(['1', '3', '5'], store.lastAction.items);
   });
 
   test('deselects items on click outside of card', function() {
     customClick(list);
     assertEquals('deselect-items', store.lastAction.name);
   });
+
+  test('adds, deletes, and moves update displayedList_', function() {
+    list.displayedIds_ = ['1', '7', '3', '5'];
+    assertDeepEquals(list.displayedIds_, list.displayedList_.map(n => n.id));
+
+    list.displayedIds_ = ['1', '3', '5'];
+    assertDeepEquals(list.displayedIds_, list.displayedList_.map(n => n.id));
+
+    list.displayedIds_ = ['1', '3', '7', '5'];
+    assertDeepEquals(list.displayedIds_, list.displayedList_.map(n => n.id));
+  });
 });